1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
murzikaleks [220]
2 years ago
6

Find the angle between the vectors u=i-9j and v=8i+5j

Mathematics
1 answer:
Katyanochek1 [597]2 years ago
7 0

Answer: \cos^{-1} \left(\frac{-37}{\sqrt{7298}} \right) \approx 115.665^{\circ}

Step-by-step explanation:

u \cdot v=(1)(8)+(-9)(5)=-37\\\\|u|=\sqrt{1^{2}+(-9)^{2}}=\sqrt{82}\\\\|v|=\sqrt{8^{2}+5^{2}}=\sqrt{89}\\\\\cos \theta=\frac{-37}{\sqrt{82}\sqrt{89}}\\\\\theta=\cos^{-1} \left(\frac{-37}{\sqrt{82}\sqrt{89}} \right)\\\\\theta=\boxed{\cos^{-1} \left(\frac{-37}{\sqrt{7298}} \right) \approx 115.665^{\circ}}

You might be interested in
Pls answer these two questions
nlexa [21]

Answer:

1. C

2. C

Hope This Helps!!!

4 0
2 years ago
Vernon writes −2 3/10 as a fraction using the same method he knows for positive mixed numbers. His work is shown: Multiply the w
love history [14]

Answer: no

Step-by-step explanation: to change a fraction back to a improper fraction

multiply the whole number by the denominator and then add it to the numerator but be careful with negative.  You can check this process by changing the improper fraction back to proper. If i change -17/10 i get -1 7/10.  the correct answer is -23/10.      

8 0
3 years ago
A sample is taken from all college freshman . Right-handed students are excluded.what is this an example of?
Anarel [89]

Answer:

<em> All college freshman </em>is called <em>Population and Right handed students are excluded is called sample from Population</em>

Step-by-step explanation:

<u>Explanation</u>:-

<em>Population:</em>-  The total of the observations which we are concerned

given data <em>all college freshman </em>is called <em>Population</em>

<u><em>Sample</em></u><em> :-</em>

<em>A sample is a subset of a Population</em>

<em>Given data  all college freshman </em>is called <em>Population and Right handed students are excluded is called sample from Population</em>

4 0
3 years ago
SOME PLEASE HELP OMG
Ilia_Sergeevich [38]

Answer: 3x plus 36

Step-by-step explanation:

You multiply inside the brackets by 3 and you get 3x+36

7 0
2 years ago
Read 2 more answers
What is a function and how does it work?
liq [111]
For f(3)...put 3 as the value of x in f(x)
for x.....put the value of f(x) from the given and equate it with 14..and solve
5 0
2 years ago
Other questions:
  • The function models the cost, in dollars, of a rug with width x feet. What is the cost of a rug that is 9 feet wide?
    5·1 answer
  • If we toss a fair coin until we get two consecutive heads or two consecutive tails, let X be the number of tosses. If you toss a
    13·1 answer
  • How much would you need to deposit in an account now in order to have $8000 in 8 years. Account earns 6% compounded monthly.
    13·1 answer
  • A car travels at a speed of 72 miles per hour. Write a direct variation equation for the distance, y, the car will travel in x h
    6·1 answer
  • The total sales tax in a certain city is 8.75%. The state sales tax rate is 7.25%, and the county adds an additional sales tax o
    13·1 answer
  • The surface area of a cone is 54 square inches. What is the surface area of a similar cone that is three times as large?
    8·1 answer
  • Dennis can walk about 2 5/6 miles each hour. About how far can he walk in 3 hours 15 ​minutes?
    8·1 answer
  • Write an equation of the line that contains point (-5,2) and is parallel to the y-axis
    8·1 answer
  • Emma brought cookies to the dinner party! She made 50 cookies but
    14·1 answer
  • Convert 123000000 milligram into kilogram ​
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!